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Optional complex element type factory method like "some.package.some.class.static.factoryMethod".

<h2>Examples:</h2>
<pre><code>
  // integrating with existing PSI implementation via IElementType constants
  {
    elementTypeFactory="com.sample.SampleElementFactory.getCompositeType"
    tokenTypeFactory="com.sample.SampleElementFactory.getTokenType"
  }
  my_rule ::= {elementType="existing_type"}
</code></pre>

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